chrontel: update to use the new set_node_attr API. CQ-DEPEND=CL:44835 BUG=none TEST=emerge-x86-zgb chrontel Change-Id: Id466350f63fec56f763f0e386f6ef113c8549b84 Reviewed-on: https://gerrit.chromium.org/gerrit/44915 Reviewed-by: Dylan Reid <[email protected]> Commit-Queue: Chih-Chung Chang <[email protected]> Tested-by: Chih-Chung Chang <[email protected]>